User Mapping

I am having an issue validating my user mapping configuration. My connection settings have tested ok but I keep getting an error on step 2.


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Status: Error

No users were found using the specified configuration. Try changing the base DN, user filter or username field.

I have the sAMAccoutnName in the username field.

Any ideas to get past this? Do I have to create an AD user/group for this to work?